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bcachefs: Centralize btree node lock initialization

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This fixes some confusion in the lockdep code due to initializing btree
node/key cache locks with the same lockdep key, but different names.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-03-03 00:03:01 -05:00
parent 1306f87de3
commit 3329cf1bb9
5 changed files with 32 additions and 6 deletions
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3
fs/bcachefs/btree_cache.c
View File

@ -119,8 +119,7 @@ static struct btree *__btree_node_mem_alloc(struct bch_fs *c, gfp_t gfp)
return NULL;
bkey_btree_ptr_init(&b->key);
six_lock_init(&b->c.lock);
lockdep_set_novalidate_class(&b->c.lock);
bch2_btree_lock_init(&b->c);
INIT_LIST_HEAD(&b->list);
INIT_LIST_HEAD(&b->write_blocked);
b->byte_order = ilog2(btree_bytes(c));

6
fs/bcachefs/btree_io.c
View File

@ -33,6 +33,8 @@ void bch2_btree_node_io_unlock(struct btree *b)
void bch2_btree_node_io_lock(struct btree *b)
{
bch2_assert_btree_nodes_not_locked();
wait_on_bit_lock_io(&b->flags, BTREE_NODE_write_in_flight,
TASK_UNINTERRUPTIBLE);
}
@ -51,12 +53,16 @@ void __bch2_btree_node_wait_on_write(struct btree *b)
void bch2_btree_node_wait_on_read(struct btree *b)
{
bch2_assert_btree_nodes_not_locked();
wait_on_bit_io(&b->flags, BTREE_NODE_read_in_flight,
TASK_UNINTERRUPTIBLE);
}
void bch2_btree_node_wait_on_write(struct btree *b)
{
bch2_assert_btree_nodes_not_locked();
wait_on_bit_io(&b->flags, BTREE_NODE_write_in_flight,
TASK_UNINTERRUPTIBLE);
}

3
fs/bcachefs/btree_key_cache.c
View File

@ -282,8 +282,7 @@ bkey_cached_alloc(struct btree_trans *trans, struct btree_path *path,
return NULL;
init:
INIT_LIST_HEAD(&ck->list);
__six_lock_init(&ck->c.lock, "b->c.lock", &bch2_btree_node_lock_key);
lockdep_set_novalidate_class(&ck->c.lock);
bch2_btree_lock_init(&ck->c);
if (pcpu_readers)
six_lock_pcpu_alloc(&ck->c.lock);

18
fs/bcachefs/btree_locking.c
View File

@ -4,7 +4,23 @@
#include "btree_locking.h"
#include "btree_types.h"
struct lock_class_key bch2_btree_node_lock_key;
static struct lock_class_key bch2_btree_node_lock_key;
void bch2_btree_lock_init(struct btree_bkey_cached_common *b)
{
__six_lock_init(&b->lock, "b->c.lock", &bch2_btree_node_lock_key);
lockdep_set_novalidate_class(&b->lock);
}
#ifdef CONFIG_LOCKDEP
void bch2_assert_btree_nodes_not_locked(void)
{
#if 0
//Re-enable when lock_class_is_held() is merged:
BUG_ON(lock_class_is_held(&bch2_btree_node_lock_key));
#endif
}
#endif
/* Btree node locking: */

8
fs/bcachefs/btree_locking.h
View File

@ -13,7 +13,13 @@
#include "btree_iter.h"
#include "six.h"
extern struct lock_class_key bch2_btree_node_lock_key;
void bch2_btree_lock_init(struct btree_bkey_cached_common *);
#ifdef CONFIG_LOCKDEP
void bch2_assert_btree_nodes_not_locked(void);
#else
static inline void bch2_assert_btree_nodes_not_locked(void) {}
#endif
static inline bool is_btree_node(struct btree_path *path, unsigned l)
{